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Surface metallization joint method of ceramic and aluminum or aluminum alloy

A technology of aluminum alloy and ceramics, which is applied in the field of surface metallization connection of ceramics and aluminum or aluminum alloys. It can solve the problems of poor performance of the connector and hinder the connection of aluminum and ceramics, so as to ensure accuracy, prevent unconnected defects, and wide application foreground effect

Inactive Publication Date: 2011-05-04
TSINGHUA UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problem that the original oxide film on the surface of aluminum hinders the connection between aluminum and ceramics, resulting in poor performance of the connection, the inventor has carried out a lot of research for a long time

Method used

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  • Surface metallization joint method of ceramic and aluminum or aluminum alloy
  • Surface metallization joint method of ceramic and aluminum or aluminum alloy

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] Embodiment 1, adopt the above-mentioned ceramic surface metallization connection device, put the Al-12wt% Si alloy into the graphite crucible, put the alumina ceramic plate (length 137mm, width 35mm, thickness 0.64mm, Tsinghua Yueke production, the alumina purity is greater than 95%) was inserted into the graphite guide rail passing through the crucible, the aluminum strip with a thickness of 0.5mm was introduced from the inlet, passed through the guide wheel and the driving wheel and led out from the outlet, and then in a nitrogen atmosphere (both the upper and lower nitrogen inlet flow rates were 20 liters) / min) heating to melt the aluminum alloy and raise the temperature to 730°C. Insert another alumina ceramic plate into the guide rail at a speed of 68.5mm / min from the guide rail entrance at the lower part of the device, and push the ceramic plate inserted into the guide rail to move vertically upward at the same speed. During the moving process, the ceramic plate ...

Embodiment 2

[0031] Example 2, except that the temperature of the upper heating body was set to 620° C., the rest was the same as that of Example 1. Observation of metallographic samples shows that the aluminum plate is closely connected on the ceramic plate, and no unconnected place is found at the interface. The tear strength was 12.0 N / mm, and fracture occurred in the aluminum nip. The experiment was repeated three times. The strength of the aluminum and ceramic connection interface is greater than 10.8N / mm.

Embodiment 3

[0032] Example 3: The rest is the same as Example 1, except that the alloy is changed to Al-12wt%Si-0.5wt%Mg alloy, and the upper and lower nitrogen flow rates are reduced to 10 liters / min. There is no defect in the connection interface between the ceramic and the aluminum, and the fracture occurs in the clamping part of the aluminum in the tear strength test. The experiment was repeated three times, and the interface connection strength was greater than 9.7N / mm.

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Abstract

The invention discloses a surface metallization joint method of ceramic and aluminum or an aluminum alloy, comprising the following steps of: (1) forming a liquid film of an aluminum alloy 1 on a joint surface of the ceramic to obtain the ceramic of which the joint surface is coated with the liquid film of the aluminum alloy 1; and (2) placing the pure aluminum or aluminum alloy 2 on the joint surface of the ceramic of which the joint surface is coated with the liquid film of the aluminum alloy 1, and soldering the ceramic, of which the joint surface is coated with the liquid film of the aluminum alloy 1, with the pure aluminum or an aluminum alloy 2 by taking the liquid film of the aluminum alloy 1 as soldering flux. With the method, an interface formed between the aluminum or the aluminum alloy film and the ceramic is prevented from the inclusion of an oxide from the aluminum surface oxidation film and is very firm and difficult to fall off, the joint strength of the interface between the aluminum or the aluminum alloy and the ceramic is proved to be very firm and exceed the strength of the aluminum per se according to the 90-degree tear strength experiment, and no defects exit on the interface, therefore, the method is suitable for the requirements of industrial production. Therefore, the method has a wide application range in the field of the joint of the ceramic and the aluminum or the aluminum alloy.

Description

technical field [0001] The invention relates to a surface metallization connection method of ceramics and aluminum or aluminum alloy. Background technique [0002] Ceramics have unique properties such as wear resistance, corrosion resistance, and high temperature resistance, and are an important engineering material. In addition, ceramics also have good thermal conductivity and insulation properties, and are also a good electronic packaging material. Because ceramics are relatively brittle, difficult to machine, poor or non-conductive, in many occasions it is often necessary to connect them with metals to make composite materials or composite structural parts, and aluminum is currently second only to steel, the most widely used engineering material and The connection of conductive materials, aluminum and ceramics is of great practical value. [0003] A lot of research has been carried out on the connection methods of ceramics and aluminum, and vacuum brazing methods, solid...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C04B37/02
Inventor 宁晓山李国才王波李莎
Owner TSINGHUA UNIV
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